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  <title>Document</title>
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  <!-- 属性:attribute(特性) -->
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    attribute的分类
      1. HTML标准制定的attribute,称为 标准的Attribute
      2. 自定义的attribute,称为 非标准的Attribute
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  <div id="abc" class="box" title="box">
    我是box
  </div>
  <a href="https://www.baidu.com">百度一下</a>

  <script>

  </script>
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